oj.uz

답안 #739717

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
739717 2023-05-11T06:39:58 Z alexdd Seesaw (JOI22_seesaw) C++17
0 / 100
 1 ms 468 KB 
#include<bits/stdc++.h>
using namespace std;
ifstream fin("seesaw.in");
#define cin fin
#define double long double
vector<double> ord;
int n;
int a[200005];
double tot,ans=1000000000;
double verif(double le)///lungimea minima daca barycentrul nu poate trece in stanga lui le
{
    double sum = tot,mxm;
    int pozs=1,pozd=n;
    //mxm = tot/n;
    mxm = tot/n;
    for(int i=1;i<=n-1;i++)
    {
        if((sum-a[pozd])/(n-i)>=le)
        {
            sum-=a[pozd];
            pozd--;
        }
        else
        {
            sum-=a[pozs];
            pozs++;
        }
        mxm = max(mxm, sum/(n-i));
        //cout<<fixed<<setprecision(15)<<sum/(n-i)<<"\n";
    }
    ans = min(ans, mxm-le);
    return mxm-le;
}
signed main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);

    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
        tot+=a[i];
    }
    for(int i=1;i<=n;i++)
    {
        double cv = 0;
        for(int j=i;j<=n;j++)
        {
            cv += a[j];
            ord.push_back(cv/(j-i+1));
        }
    }
    sort(ord.begin(),ord.end());
    while(ord[ord.size()-1]>tot/n)
        ord.pop_back();
    /*for(int i=0;i<=19396720;i+=5000)
    {
        cout<<i<<" ";
        cout<<fixed<<setprecision(15)<<verif(i)<<"\n";
    }
    return 0;*/
    /*double st,dr,mij1,mij2;
    st=0;
    dr=tot/n;
    for(int i=0;i<100;i++)
    {
        mij1 = st + (dr-st)/3;
        mij2 = mij1 + (dr-st)/3;
        //if(verif(mij1)==verif(mij2)) cout<<"--- equal ---\n";
        if(verif(mij1)<verif(mij2))
            dr=mij2;
        else
            st=mij1;
    }*/
    int st,dr,mij1,mij2;
    st=0;
    dr=ord.size()-1;
    while(dr-st+1>=1000)
    {
        mij1 = st + (dr-st+1)/3;
        mij2 = mij1 + (dr-st+1)/3;
        if(verif(ord[mij1])<verif(ord[mij2]))
            dr=mij2;
        else
            st=mij1;
    }
    for(int i=st;i<=dr;i++)
        ans = min(ans, verif(ord[i]));
    cout<<fixed<<setprecision(15)<<ans;
    return 0;
}
/**


*/

Subtask #1
0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 1 ms 468 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #2
0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 1 ms 468 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #3
0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 1 ms 468 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #4
0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 1 ms 468 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -